FROMLIST: gunyah: Add hypercalls for demand paging

Three hypercalls are needed to support demand paging.
In create page mappings for a virtual machine's address space, memory
must be moved to a memory extent that is allowed to be mapped into that
address space. Memory extents are Gunyah's implementation of access
control. Once the memory is moved to the proper memory extent, the
memory can be mapped into the VM's address space. Implement the
bindings to perform those hypercalls.

Bug: 338347082
Link: https://lore.kernel.org/all/20240222-gunyah-v17-16-1e9da6763d38@quicinc.com/


Change-Id: I2636854bc961700142a7dfa9f102111ebfbc6dcb
Signed-off-by: Elliot Berman <quic_eberman@quicinc.com>